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This information was developed for North Carolina and may not apply to other areas.

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Table Legend

* Degree of importance of pest: I = Important pest, high probability of occurrence; II = Treat as needed; III = Occasional pest, treat when detected.

** Number of applications needed for most effective control. It is usually best to wait 10 to 14 days between applications in cool weather and 7 to 10 days between applications in warm weather.

G = granular; P = prune out infested twigs or branches; S = spray application.

Rhododendron Pest Management Calendar

The Rhododendron Pest Management Calendar gives approximate dates for pest emergence.

Rhododendron Pest Management Calendar

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The Rhododendron Pest Management Calendar gives approximate dates for pest emergence
Pests Degree of Importance of Pest* Number of applications** Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
azalea stem borer II 1

Spray

Application

Spray

Application

Spray

Application/

prune out infested twigs or branches

prune out infested twigs or branches prune out infested twigs or branches prune out infested twigs or branches prune out infested twigs or branches prune out infested twigs or branches
black vine weevil I 3 granular granular granular

Spray

Application

Spray

Application

Spray

Application

Spray

Application

Spray

Application

climbing cutworms III 1

Spray

Application

Spray

Application

Japanese weevil II 1 or 2

Spray

Application

Spray

Application

Spray

Application

lace bugs II 1 or 2

Spray

Application

Spray

Application

Spray

Application

Spray

Application

Spray

Application

Spray

Application

Spray

Application

rhododendron borer II 1

Spray

Application

Spray

Application

Spray

Application/

prune out infested twigs or branches

prune out infested twigs or branches prune out infested twigs or branches prune out infested twigs or branches prune out infested twigs or branches prune out infested twigs or branches
rhododendron gall midge II 2

Spray

Application

Spray

Application

Spray

Application

Spray

Application

* Degree of importance of pest: I=Important pest, high probability of occurrence, II=Treat as needed: III=Occasional pest, treat when detected.

** Number of applications needed for most effective control. It is usually best to wait 10 to 14 days between applications in cool weather and 7 to 10 days between applications in warm weather.

Other Resources

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For assistance with a specific problem, contact your local N.C. Cooperative Extension Center.

This Insect Note has not been peer reviewed.

Authors

Professor and Extension Specialist
Entomology & Plant Pathology
Professor Emeritus
Entomology & Plant Pathology

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Publication date: Feb. 4, 2019
Revised: Nov. 10, 2023

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